apparently related and causing secretary clinton to postpone her testimony on the benghazi terror attack. doctors say the blood clot is very risky. >> blood clots are serious depending where they are. the leg is more common and simpler to treat. lungs are more life threaten, into the brain of course, very, very serious if it is in the brain because of stroke and potential memory and injury to the entire brain. gregg: david lee miller is live in new york city with the very latest. and, david, what do we know about the location of that blood clot? >> reporter: gregg, the authorities have not released that information. they have only disclosed she is being treated for a clot. she fainted earlier this month and hit her head causing a discussion. the clot was discovered in a follow-up exam. the state department issued a statement. it said in part, and i quote, secretary clinton's doctors suffered a blood clot had been formed because of con caution she sustained several weeks ago. she is being treated and at new york presbyterian and can be monitored her condition over the next 48 hours. clint